Permanently redirect to /s/... for share links (#4067)

app/utils/routeHelpers.test.ts

@@ -0,0 +1,14 @@
+import { sharedDocumentPath } from "./routeHelpers";
+
+describe("#sharedDocumentPath", () => {
+  test("should return share path for a document", () => {
+    const shareId = "1c922644-40d8-41fe-98f9-df2b67239d45";
+    const docPath = "/doc/test-DjDlkBi77t";
+    expect(sharedDocumentPath(shareId)).toBe(
+      "/s/1c922644-40d8-41fe-98f9-df2b67239d45"
+    );
+    expect(sharedDocumentPath(shareId, docPath)).toBe(
+      "/s/1c922644-40d8-41fe-98f9-df2b67239d45/doc/test-DjDlkBi77t"
+    );
+  });
+});